/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 *
 *   Copyright (C) 2009, 2011-2012, 2014 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

#ifndef _INCLUDE_STREAMS_H
#define _INCLUDE_STREAMS_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>
#include <stdio.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Public Types
 ****************************************************************************/

/* These are the generic representations of a streams used by the TinyAra */

struct lib_instream_s;
typedef int (*lib_getc_t)(FAR struct lib_instream_s *this);

struct lib_outstream_s;
typedef void (*lib_putc_t)(FAR struct lib_outstream_s *this, int ch);
typedef int (*lib_flush_t)(FAR struct lib_outstream_s *this);

struct lib_instream_s {
	lib_getc_t get;				/* Get one character from the instream */
	int nget;					/* Total number of characters gotten.  Written
								 * by get method, readable by user */
};

struct lib_outstream_s {
	lib_putc_t put;				/* Put one character to the outstream */
#ifdef CONFIG_STDIO_LINEBUFFER
	lib_flush_t flush;			/* Flush any buffered characters in the outstream */
#endif
	int nput;					/* Total number of characters put.  Written
								 * by put method, readable by user */
};

/* Seek-able streams */

struct lib_sistream_s;
typedef int (*lib_sigetc_t)(FAR struct lib_sistream_s *this);
typedef off_t (*lib_siseek_t)(FAR struct lib_sistream_s *this, off_t offset, int whence);

struct lib_sostream_s;
typedef void (*lib_soputc_t)(FAR struct lib_sostream_s *this, int ch);
typedef int (*lib_soflush_t)(FAR struct lib_sostream_s *this);
typedef off_t (*lib_soseek_t)(FAR struct lib_sostream_s *this, off_t offset, int whence);

struct lib_sistream_s {
	lib_sigetc_t get;			/* Get one character from the instream */
	lib_siseek_t seek;			/* Seek to a position in the instream */
	int nget;					/* Total number of characters gotten.  Written
								 * by get method, readable by user */
};

struct lib_sostream_s {
	lib_soputc_t put;			/* Put one character to the outstream */
#ifdef CONFIG_STDIO_LINEBUFFER
	lib_soflush_t flush;		/* Flush any buffered characters in the outstream */
#endif
	lib_soseek_t seek;			/* Seek a position in the output stream */
	int nput;					/* Total number of characters put.  Written
								 * by put method, readable by user */
};

/* These are streams that operate on a fixed-sized block of memory */

struct lib_meminstream_s {
	struct lib_instream_s public;
	FAR const char *buffer;		/* Address of first byte in the buffer */
	size_t buflen;				/* Size of the buffer in bytes */
};

struct lib_memoutstream_s {
	struct lib_outstream_s public;
	FAR char *buffer;			/* Address of first byte in the buffer */
	size_t buflen;				/* Size of the buffer in bytes */
};

struct lib_memsistream_s {
	struct lib_sistream_s public;
	FAR const char *buffer;		/* Address of first byte in the buffer */
	size_t offset;				/* Current buffer offset in bytes */
	size_t buflen;				/* Size of the buffer in bytes */
};

struct lib_memsostream_s {
	struct lib_sostream_s public;
	FAR char *buffer;			/* Address of first byte in the buffer */
	size_t offset;				/* Current buffer offset in bytes */
	size_t buflen;				/* Size of the buffer in bytes */
};

/* These are streams that operate on a FILE */

struct lib_stdinstream_s {
	struct lib_instream_s public;
	FAR FILE *stream;
};

struct lib_stdoutstream_s {
	struct lib_outstream_s public;
	FAR FILE *stream;
};

struct lib_stdsistream_s {
	struct lib_sistream_s public;
	FAR FILE *stream;
};

struct lib_stdsostream_s {
	struct lib_sostream_s public;
	FAR FILE *stream;
};

/* These are streams that operate on a file descriptor */

struct lib_rawinstream_s {
	struct lib_instream_s public;
	int fd;
};

struct lib_rawoutstream_s {
	struct lib_outstream_s public;
	int fd;
};

struct lib_rawsistream_s {
	struct lib_sistream_s public;
	int fd;
};

struct lib_rawsostream_s {
	struct lib_sostream_s public;
	int fd;
};

/****************************************************************************
 * Public Variables
 ****************************************************************************/

#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Name: lib_meminstream, lib_memoutstream, lib_memsistream, lib_memsostream
 *
 * Description:
 *   Initializes a stream for use with a fixed-size memory buffer.
 *   Defined in lib/stdio/lib_meminstream.c and lib/stdio/lib_memoutstream.c.
 *   Seekable versions are defined in lib/stdio/lib_memsistream.c and
 *   lib/stdio/lib_memsostream.c.
 *
 * Input parameters:
 *   memstream    - User allocated, uninitialized instance of struct
 *                  lib_meminstream_s to be initialized.
 *   memstream    - User allocated, uninitialized instance of struct
 *                  lib_memoutstream_s to be initialized.
 *   bufstart     - Address of the beginning of the fixed-size memory buffer
 *   buflen       - Size of the fixed-sized memory buffer in bytes
 *
 * Returned Value:
 *   None (User allocated instance initialized).
 *
 ****************************************************************************/

void lib_meminstream(FAR struct lib_meminstream_s *instream, FAR const char *bufstart, int buflen);
void lib_memoutstream(FAR struct lib_memoutstream_s *outstream, FAR char *bufstart, int buflen);
void lib_memsistream(FAR struct lib_memsistream_s *instream, FAR const char *bufstart, int buflen);
void lib_memsostream(FAR struct lib_memsostream_s *outstream, FAR char *bufstart, int buflen);

/****************************************************************************
 * Name: lib_stdinstream, lib_stdoutstream
 *
 * Description:
 *   Initializes a stream for use with a FILE instance.
 *   Defined in lib/stdio/lib_stdinstream.c and lib/stdio/lib_stdoutstream.c
 *
 * Input parameters:
 *   instream  - User allocated, uninitialized instance of struct
 *               lib_stdinstream_s to be initialized.
 *   outstream - User allocated, uninitialized instance of struct
 *               lib_stdoutstream_s to be initialized.
 *   stream    - User provided stream instance (must have been opened for
 *               the correct access).
 *
 * Returned Value:
 *   None (User allocated instance initialized).
 *
 ****************************************************************************/

void lib_stdinstream(FAR struct lib_stdinstream_s *instream, FAR FILE *stream);
void lib_stdoutstream(FAR struct lib_stdoutstream_s *outstream, FAR FILE *stream);
void lib_stdsistream(FAR struct lib_stdsistream_s *instream, FAR FILE *stream);
void lib_stdsostream(FAR struct lib_stdsostream_s *outstream, FAR FILE *stream);

/****************************************************************************
 * Name: lib_rawinstream, lib_rawoutstream, lib_rawsistream, and
 *       lib_rawsostream,
 *
 * Description:
 *   Initializes a stream for use with a file descriptor.
 *   Defined in lib/stdio/lib_rawinstream.c and lib/stdio/lib_rawoutstream.c.
 *   Seekable versions are defined in lib/stdio/lib_rawsistream.c and
 *   lib/stdio/lib_rawsostream.c
 *
 * Input parameters:
 *   instream  - User allocated, uninitialized instance of struct
 *               lib_rawinstream_s to be initialized.
 *   outstream - User allocated, uninitialized instance of struct
 *               lib_rawoutstream_s to be initialized.
 *   fd        - User provided file/socket descriptor (must have been opened
 *               for the correct access).
 *
 * Returned Value:
 *   None (User allocated instance initialized).
 *
 ****************************************************************************/

void lib_rawinstream(FAR struct lib_rawinstream_s *instream, int fd);
void lib_rawoutstream(FAR struct lib_rawoutstream_s *outstream, int fd);
void lib_rawsistream(FAR struct lib_rawsistream_s *instream, int fd);
void lib_rawsostream(FAR struct lib_rawsostream_s *outstream, int fd);

/****************************************************************************
 * Name: lib_lowinstream, lib_lowoutstream
 *
 * Description:
 *   Initializes a stream for use with low-level, architecture-specific I/O.
 *   Defined in lib/stdio/lib_lowinstream.c and lib/stdio/lib_lowoutstream.c
 *
 * Input parameters:
 *   lowinstream  - User allocated, uninitialized instance of struct
 *                  lib_lowinstream_s to be initialized.
 *   lowoutstream - User allocated, uninitialized instance of struct
 *                  lib_lowoutstream_s to be initialized.
 *
 * Returned Value:
 *   None (User allocated instance initialized).
 *
 ****************************************************************************/

#ifdef CONFIG_ARCH_LOWGETC
void lib_lowinstream(FAR struct lib_instream_s *lowinstream);
#endif
#ifdef CONFIG_ARCH_LOWPUTC
void lib_lowoutstream(FAR struct lib_outstream_s *lowoutstream);
#endif

/****************************************************************************
 * Name: lib_zeroinstream, lib_nullinstream, lib_nulloutstream
 *
 * Description:
 *   Initializes NULL streams:
 *
 *   o The stream created by lib_zeroinstream will return an infinitely long
 *     stream of zeroes. Defined in lib/stdio/lib_zeroinstream.c
 *   o The stream created by lib_nullinstream will return only EOF.
 *     Defined in lib/stdio/lib_nullinstream.c
 *   o The stream created by lib_nulloutstream will write all data to the
 *     bit-bucket. Defined in lib/stdio/lib_nulloutstream.c
 *
 * Input parameters:
 *   zeroinstream  - User allocated, uninitialized instance of struct
 *                   lib_instream_s to be initialized.
 *   nullinstream  - User allocated, uninitialized instance of struct
 *                   lib_instream_s to be initialized.
 *   nulloutstream - User allocated, uninitialized instance of struct
 *                   lib_outstream_s to be initialized.
 *
 * Returned Value:
 *   None (User allocated instance initialized).
 *
 ****************************************************************************/

void lib_zeroinstream(FAR struct lib_instream_s *zeroinstream);
void lib_nullinstream(FAR struct lib_instream_s *nullinstream);
void lib_nulloutstream(FAR struct lib_outstream_s *nulloutstream);

/****************************************************************************
 * Name: lib_sylogstream
 *
 * Description:
 *   Initializes a stream for use with the configured syslog interface.
 *
 * Input parameters:
 *   lowoutstream - User allocated, uninitialized instance of struct
 *                  lib_lowoutstream_s to be initialized.
 *
 * Returned Value:
 *   None (User allocated instance initialized).
 *
 ****************************************************************************/

#ifdef CONFIG_SYSLOG
void lib_syslogstream(FAR struct lib_outstream_s *stream);
#endif

/****************************************************************************
 * Name: lib_noflush
 *
 * Description:
 *  lib_noflush() provides a common, dummy flush method for output streams
 *  that are not flushable.  Only used if CONFIG_STDIO_LINEBUFFER is selected.
 *
 * Return:
 *  Always returns OK
 *
 ****************************************************************************/

#ifdef CONFIG_STDIO_LINEBUFFER
int lib_noflush(FAR struct lib_outstream_s *stream);
#endif

/****************************************************************************
 * Name: lib_snoflush
 *
 * Description:
 *  lib_snoflush() provides a common, dummy flush method for seekable output
 *  streams that are not flushable.  Only used if CONFIG_STDIO_LINEBUFFER
 *  is selected.
 *
 * Return:
 *  Always returns OK
 *
 ****************************************************************************/

#ifdef CONFIG_STDIO_LINEBUFFER
int lib_snoflush(FAR struct lib_sostream_s *this);
#endif

/****************************************************************************
 * Name: lib_sprintf and lib_vsprintf
 *
 * Description:
 *  Stream-oriented versions of sprintf and vsprintf.
 *
 ****************************************************************************/

int lib_sprintf(FAR struct lib_outstream_s *obj, FAR const char *fmt, ...);
int lib_vsprintf(FAR struct lib_outstream_s *obj, FAR const char *src, va_list ap);

#undef EXTERN
#if defined(__cplusplus)
}
#endif

#endif							/* _INCLUDE_STREAMS_H */
